Colloidal Spherical Quantum Wells with Near-Unity Photoluminescence Quantum Yield and Suppressed Blinking

Authors
Jeong, Byeong GukPark, Young-ShinChang, Jun HyukCho, IkjunKim, Jai KyeongKim, HeesukChar, KookheonCho, JinhanKlirnov, Victor I.Park, PhilipLee, Doh C.Bae, Wan Ki
Issue Date
2016-10
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v.10, no.10, pp.9297 - 9305
Abstract
Thick inorganic shells endow colloidal nanocrystals (NCs) with enhanced photochemical stability and suppression of photoluminescence intermittency (also known as blinking). However, the progress of using thick-shell 100 90 heterostructure NCs in applications has been limited due to the low photoluminescence quantum yield (PL QY <= 60%) at room temperature. Here, we demonstrate thick-shell NCs with CdS/CdSe/CdS seed/spherical quantum well/shell (SQW) geometry that exhibit near-unity PL QY at room temperature and suppression of blinking. In SQW NCs, the lattice mismatch is diminished between the emissive CdSe layer and the surrounding CdS layers as a result of coherent strain, which suppresses the formation of misfit defects and consequently permits, similar to 100% PL QY for SQW NCs with a thick CdS shell (>5 nm). High PL QY of thick-shell SQW NCs is preserved even in concentrated dispersion and in film under thermal stress, which makes them promising candidates for applications in solid-state concentrators.
Keywords
LIGHT-EMITTING-DIODES; LUMINESCENT SOLAR CONCENTRATORS; CORE-SHELL NANOCRYSTALS; AUGER RECOMBINATION; EPITAXIAL MULTILAYERS; HIGHLY LUMINESCENT; DOTS; CDSE; PERFORMANCE; THICKNESS; LIGHT-EMITTING-DIODES; LUMINESCENT SOLAR CONCENTRATORS; CORE-SHELL NANOCRYSTALS; AUGER RECOMBINATION; EPITAXIAL MULTILAYERS; HIGHLY LUMINESCENT; DOTS; CDSE; PERFORMANCE; THICKNESS; spherical quantum well; near-unity photoluminescence quantum yield; coherently strained heterostructure; misfit defect; critical thickness
ISSN
1936-0851
URI
https://pubs.kist.re.kr/handle/201004/123638
DOI
10.1021/acsnano.6b03704
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KIST Article > 2016
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